.affix1{
	position: fixed;
}

.thumbnail{
	height: 220px;
	position: relative;
	overflow: hidden;
	z-index: 20px;
}
.thumbnail{
background-color: gainsboro;
}
.thumbnail .caption h3{
	z-index: 30;
	text-align: center;
	margin-top: 0px;
}
.img-pop{
	margin-left: -10px;
	height: 60px;
	width: 300px;
	background-color: #fff;
	position: absolute;
	color: blueviolet;
	top: 220px;
	z-index: 40;
	text-align: center;
}
.img-pop blockquote p{
	width: 220px;
	margin-left:20px ;
    margin-right: 20px;
	text-align: left;
}
.item img{
	
}

/*回到顶端样式*/
#backtop span{
	font-size:60px ;
	left: 50%;
	margin-left: 500px;
	bottom: 40px;
	top: 80%;
	position: fixed;
}
